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13．The theory putforwardby Einstein was later proved to be true． 试题答案
分析 由爱因斯坦提出的理论后来被证明是正确的．
解答 答案是forward．本题考查动词短语；put forward表示"提出"；题干中过去分词短语 put _____ by Einstein充当the theory 的定语，由此推断是"由爱因斯坦提出的理论"，所以选用短语put forward，故答案是forward．
点评 关于短语动词的解题，首先要积累识记尽可能多的短语动词及其含义，然后结合语境进行合理的推断．
The largest land animal remaining on the earth, the African elephant is of much importance to African ecosystem. Unlike other animals, the African elephant is to a great extent the builder of its environment. As a giant plant-eater, it significantly shapes the forest-and-savanna (大草原) surroundings in which it lives, therefore deciding the conditions of existence for millions of other animals that live in its habitat.
It is the elephant’s great desire for food that makes it both a disturber of the environment and an important builder of its habitat. In its continuous search for the 300 pounds of plants it must have every day, it kills small trees and underbushes, as well as pulls branches off big trees. This results in numerous open spaces in not only deep tropical forests but also the woodlands that cover part of the African savannas. In these open spaces are numerous plants in various stages of growth, which attract a variety of other plant-eaters.
Take the rain forests for example. In their natural state, the spreading branches overhead shut out sunlight and prevent the growth of plants on the forest floor. By pulling down trees and eating plants, elephants create open spaces, allowing new plants to grow on the forest floor. In such situations, the forests become suitable for large-hoofed plant-eaters to move around and for small-sized plant-eaters to obtain their food as well.
Scientists are worried now that the African elephant has become an endangered species. If the elephant dies out, scientists say, many other animals will also disappear from vast areas of forest and savanna, greatly changing and worsening the whole ecosystem.
1.What is the passage mainly about?
A. Disappearance of African elephants.
B. Forests and savannas as habitats for African elephants.
C. The effect of African elephants' search for food.
D. The eating habit of African elephants.
2.The African elephant influences the ecosystem in the following ways except that .
A. it creates open areas in deep tropical forests as well as woodlands
B. it pulls off the branches and leaves, shutting out the sunshine
C. its eating habit can be made use of by large-hoofed and small-sized animals
D. it encourages some kinds of plants growing in an indirect way
3.According to the passage, which of the following statements is true?
A. Numerous grown plants are the favorites of plant-eaters.
B. The extinction of the African elephant has nothing to do with the ecosystem.
C. Quantities of plants are consumed by African elephants, including branches and underbushes.
D. The forest floor in rain forests is scarcely dotted with new shoots.
4.The passage is developed mainly by .
A. presenting the changes in time order
B. making comparisons and giving examples
C. classifying similarities and differences
D. showing the effect and then explaining the reasons
